Reconstructing the experienced temperature during the larval oceanic migration of anguillid eels from otolith stable oxygen isotopes
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Янв. 10, 2025
Migration
routes
and
the
depth
patterns
of
anguillid
eel
larvae
migrating
long
distances
from
spawning
grounds
in
ocean
remain
poorly
understood.
We
used
otolith
stable
isotope
analysis
to
study
oceanic
migrations
eels
by
reconstructing
experienced
water
temperature
histories
larvae.
The
oxygen
isotopes
(δ18Ootolith)
recruited
Anguilla
japonica
glass
were
analyzed
assess
relationship
with
early
larval
stage
laboratory
experiments.
A
negative
linear
between
rearing
δ18Ootolith
values
was
observed
for
leptocephali
reared
at
five
different
temperatures
19
°C
27
°C.
Subsequently,
obtained
equation
applied
estimate
wild-caught
during
their
migration
according
recruitment
latitude,
season,
species.
A.
significantly
higher
latitudes
Taiwan
Japan
later
periods
6
months,
November
March,
indicating
that
individuals
exposed
lower
along
Kuroshio
flowing
northward
as
they
reached
seasons.
Furthermore,
temperate
than
those
tropical
marmorata,
same
locations
southern
Taiwan.
This
suggests
migratory
behavior
may
differ
two
species,
although
have
sympatric
areas
western
North
Pacific.
Collectively,
these
results
suggest
provides
a
reasonable
estimation
prove
useful
history
ocean.
Язык: Английский
Environmental DNA metabarcoding reveals the effect of river slope on diadromous fish communities in island rivers
Marine and Freshwater Research,
Год журнала:
2024,
Номер
75(9)
Опубликована: Июнь 12, 2024
Understanding
the
natural
factors
that
influence
diadromous
fish
communities
in
river
ecosystems
is
crucial
for
effective
biodiversity
management.
However,
this
remains
an
unexplored
and
challenging
task.
Here,
relationship
between
morphology
within
rivers
was
explored.
We
focused
on
slope
estuary
size,
as
these
may
constrain
their
upstream
migration
affect
availability
of
important
nursery
grounds
some
species.
Using
environmental
DNA
metabarcoding,
we
investigated
12
subtropical
Yakushima
Island,
southern
Japan,
compared
community
differences
among
with
different
slopes
sizes.
Fewer
species
were
detected
steeper
smaller
estuaries.
Additionally,
similarity
greater
analogous
gradients
These
results
indicate
exert
a
species-selective
effect
by
affecting
estuarine
habitat
availability,
thereby
playing
role
shaping
composition
rivers.
Conserving
gentle-gradient
large
estuaries
would
be
preserving
diversity
species,
which
play
especially
tropical
oceanic
islands.
Язык: Английский
Differences in odor preferences of glass eels of two sympatric anguillid eels, the Japanese eel Anguilla japonica and the Indo‐Pacificeel A. marmorata
Journal of Fish Biology,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 3, 2024
Water-choice
experiments
were
conducted
using
glass
eels
of
Anguilla
japonica
and
A.
marmorata,
which
coexist
in
subtropical
East
Asian
rivers.
The
results
the
present
study,
together
with
those
previous
water-choice
experiments,
suggest
that
salinity
enhances
odor
preferences
eels.
Compared
to
marmorata
eels,
more
strongly
attracted
water
collected
from
a
leaf
detritus-accumulating
backwater
area
than
normal
river
under
same
conditions.
These
interspecific
differences
may
facilitate
their
habitat
segregation.
Язык: Английский
Daytime habitat use by Japanese eel in small streams in Shikoku, southwestern Japan
Environmental Biology of Fishes,
Год журнала:
2023,
Номер
106(12), С. 2113 - 2125
Опубликована: Ноя. 28, 2023
Язык: Английский
Environmental DNA Reveals Geographic Distributions of Two eel Species, Anguilla japonica and A. marmorata, in Western Kyushu, Japan
ZOOLOGICAL SCIENCE,
Год журнала:
2024,
Номер
41(4)
Опубликована: Апрель 26, 2024
Some
anguillid
eels
migrate
thousands
of
kilometers
from
their
spawning
grounds,
dispersing
across
vast
geographic
areas
to
fresh
and
brackish
water
habitats,
where
they
settle
grow.
Japanese
(
Язык: Английский
Can displaced Anguilla marmorata return to their original habitat? Daily tracking study of their homing behavior
Journal of Fish Biology,
Год журнала:
2024,
Номер
105(3), С. 998 - 1003
Опубликована: Май 29, 2024
Abstract
Anguilla
marmorata
collected
in
the
Odana
River
lower
reaches
were
passive
integrated
transponder‐tagged
displaced
and
released
into
upper
river
(54
up‐transported
eels),
eels
tagged
downstream
(52
down‐transported
eels).
Their
movements
detected
once
per
day
for
10
days
using
a
portable
radio‐frequency
identification
(RFID)
system.
The
homing
rate
of
was
38.9%,
compared
to
3.7%
eels,
suggesting
that
inhabiting
upstream
areas
have
relatively
high
fidelity
their
habitats
less
fidelity.
Язык: Английский
Asymmetric competition for habitats between the temperate Japanese eel Anguilla japonica and the tropical Indo-Pacific eel A. marmorata
Aquatic Sciences,
Год журнала:
2024,
Номер
86(4)
Опубликована: Окт. 1, 2024
Abstract
Habitat
segregation
is
a
common
phenomenon
among
anguillids
in
rivers
where
multiple
species
coexist.
However,
despite
the
growing
need
to
conserve
their
river
habitats,
mechanisms
underlying
such
remain
unknown.
Here,
we
conducted
tank
experiments
investigate
competitive
superiority
for
habitats
between
temperate
Japanese
eel
Anguilla
japonica
and
tropical
Indo-Pacific
marmorata
,
which
co-occur
East
Asian
subtropical
rivers.
Using
eight
interspecific
pairs
of
these
two
comparable
total
length,
compared
use
single
pipe
shelter,
recorded
over
24-h
experimental
period,
solitary
paired
conditions.
The
changes
shelter
patterns
conditions
indicated
that
condition,
was
occupied
by
A.
five
(62.5%)
end
experiment
while
appeared
occupy
only
one
pair
(12.5%).
Furthermore,
agonistic
behaviors,
occurred
mainly
at
night,
as
biting
head-butting,
were
observed
much
more
frequently
toward
(mean
±
standard
deviation:
23.2
36.6
times
per
individual)
than
(0.4
0.5
individual),
indicating
an
asymmetry
aggressiveness.
These
results
suggest
can
negatively
affect
diurnal
habitat
nocturnal
activities
sympatric
.
findings,
combined
with
those
from
previous
field
studies,
may
competitively
exclude
stream
large
substrate
sizes.
This
asymmetric
competition
contribute
shaping
riverine
distribution
composition
within
they
co-occur.
Язык: Английский